Method of protecting the surface of metal molds



Jan. 26 1926.

Original Filed May 6, 1922 INVENTORS,

A TTORNEY.

Patented Jan. 26, 1926.

UNITED STATES PATENT OFFICE.

STANLEY I. UDALE ANDJJANIEL H. IELOCHE, OF DETROIT. IICHIGANZ.

na'rnon or rno'rncrme 'rnzn' summon or METAL moans.

Original application filed Kay 6, 1822, Serial In. 550,078. Divided and this application iilecl Kay 18,

1885. Serial 1T0. 32,279.

United States, residing at 893 Lothrop Ave,

5 and 2490 Hazelwood Ave, Detroit, respectiveilly, in the county of Wayne and State of ichigan,'have invented certain new and useful Improvements in Methods of Protecting the Surface of Metal Molds, of.

which the following is a specification.

This invention relates to improved means for the protection of surfaces of metal molds used in the continuous production of metal castings. This invention consists essentially in the application to a permanent mold of a refractory coating applied by means of a blow torch.

. The molds are preferably made of cast iron and the chief object of this invention'is to provide means for the protection of the surfaces of such molds when used for the production of gray iron castin s.

The actual method racticed y the applicants is shown in the gure, in which a pipe A is connected to a regulable supply of oxygen and acetylene. The pipe A is threaded into the casing B, which is preferably lined with a refractoryvcoatin Air entrances G and D may be provide as required. A depression E is located in the casing B forming acrater. Opposite this crater E is the o ening F, through which the refractory pow er is; fed into the crater E. The casing B and crater E are protected by a refractory lining G. The amount of oxygen and the area of the air openings C and D are regulated so that an-intensely hot flame results. H represents a permanent master positive mold which is to be protected b means of a refractory coatin The ame is directed against the modds H and as the refractory owder is highl heated as it travels towar the mold throug' the flame it therefore arrives at the mold in Y a highly heated state and as the mold is also heated by the flame directed upon it, the refractory substance adheres to the mold. The refractory particles, which are very finely divided, are at a white heat when they strike the heated mold, which accounts for the fact that they do adhere firmly enough The function ofthe crater is to catch' particles not carried directly into the flame, eat these particles, and by means of the violent eddy in this crater to return theseparticles to the flame. Y

This application is a divisional a plication of our Patent #1,536,952,'is sue May 5th, 1925. 7

What we claim is The method of protecting the metal surface of permanent iron molds, which'consists in heating thesurface of the iron molds by means of the flame of a blow torch directed against the surface of-the said molds and injecting into the flame powered magneslum oxide, whereby the particles of magnesium oxide arecarried against the surface of the iron molds which are thereby coated with the magnesium oxide.

In testimony whereof we aiiix our signa "v tures.

STANLEY M. UDALE. DANIEL H. MELOCHE. 

